I actually never had it myself, but my friends (jp and foreign) all said it was the worst they they'd ever drank. Worse than the original square-soft potions (the second ones were ok) and worse than curry ramune.

If you have a bottle, I'd be up for a taste-test.

I wish I did. I drank them all up as soon as I could get my hands on them. Those Final-fantasy potions were barf-arific though, truly.